颤振动态改变DraggableScrollableSheet的高度

import 'package:flutter/material.dart';

class MyPage extends StatefulWidget {
  @override
  _MyPageState createState() => _MyPageState();
}

class _MyPageState extends State<MyPage> {
  double _sheetHeight = 200.0; // 初始高度

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('DraggableScrollableSheet'),
      ),
      body: Stack(
        children: [
          // 主内容区域
          Container(
            color: Colors.white,
            child: Center(
              child: Text('Main Content'),
            ),
          ),
          // 底部滚动面板
          Positioned(
            bottom: 0,
            left: 0,
            right: 0,
            child: GestureDetector(
              onVerticalDragUpdate: (details) {
                setState(() {
                  // 根据手势滑动的距离来改变高度
                  _sheetHeight -= details.delta.dy;
                });
              },
              child: DraggableScrollableSheet(
                initialChildSize: _sheetHeight / MediaQuery.of(context).size.height,
                minChildSize: 0.1,
                maxChildSize: 0.8,
                builder: (BuildContext context, ScrollController scrollController) {
                  return Container(
                    color: Colors.grey[200],
                    child: ListView.builder(
                      controller: scrollController,
                      itemCount: 20,
                      itemBuilder: (BuildContext context, int index) {
                        return ListTile(
                          title: Text('Item $index'),
                        );
                      },
                    ),
                  );
                },
              ),
            ),
          ),
        ],
      ),
    );
  }
}